Typing Multilingual Text in Terminal

I personally don't have much need to read/write Unicode in OS X's Unix command-line environment, but some people do find this useful or essential. Whether you can get it work satisfactorily depends on the languages and apps you are using and probably also on the fonts you have. Getting started involves setting Terminal's preferences correctly and creating .inputrc and .profile files in your Home directory to change the bash shell default behavior. Details on how to do this can be found here. That may be enough for some purposes. If not, some suggestions for further refinements are here.